<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :data="data"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="fileUpload"
      v-if="!disabled">
      <!-- 上传按钮 -->
      <el-button type="primary">选取文件</el-button>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip && !disabled">
      请上传
      <template v-if="fileSize">
        大小不超过
        <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为
        <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      的文件
    </div>
    <!-- 文件列表 -->
    <transition-group
      ref="uploadFileList"
      class="upload-file-list el-upload-list el-upload-list--text"
      :class="showBtn ? '' : 'line'"
      name="el-fade-in-linear"
      tag="ul">
      <li
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
        :key="file.uid || file.fileId">
        <!-- <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank"> -->
        <!-- <el-link :href="`${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document">{{ getFileName(file.name) }}</span>
        </el-link> -->
        <el-button link type="primary" @click="handleDownload(file)" :underline="false" target="_blank">
          <span class="el-icon-document">{{ getFileName(file.name) }}</span>
        </el-button>
        <div v-if="showBtn" class="ele-upload-list__item-content-action">
          <el-button link type="primary" @click="handlePreview(file)">预览</el-button>
          <el-button link type="primary" @click="handleDownload(file)">下载</el-button>
          <el-button link @click="handleDelete(index)" type="danger" v-if="!disabled">&nbsp;删除</el-button>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script setup>
import { getToken } from '@/utils/auth'
import Sortable from 'sortablejs'
import { getFileDetail } from '@/api/system/file.js'
import { handleDownload as handleDownloadFile } from '@/utils/download.js'

const props = defineProps({
  // 文件是否为url格式
  isUrl: {
    type: Boolean,
    default: false,
  },
  modelValue: [String, Object, Array],
  // 上传接口地址
  action: {
    type: String,
    default: '/ruoyi-system/upload',
  },
  // 上传携带的参数
  data: {
    type: Object,
  },
  // 数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ['png', 'jpg', 'jpeg', 'pdf'],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  // 禁用组件（仅查看文件）
  disabled: {
    type: Boolean,
    default: false,
  },
  // 拖动排序
  drag: {
    type: Boolean,
    default: true,
  },
  // 是否展示操作按钮
  showBtn: {
    type: Boolean,
    default: true,
  },
})

const { proxy } = getCurrentInstance()
const emit = defineEmits()
const number = ref(0)
const uploadList = ref([])
const baseUrl = import.meta.env.VITE_APP_BASE_API
const uploadFileUrl = ref(import.meta.env.VITE_APP_BASE_API + props.action) // 上传文件服务器地址
const headers = ref({ Authorization: 'Bearer ' + getToken() })
const fileList = ref([])
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize))

watch(
  () => props.modelValue,
  val => {
    if (val) {
      // 如果是url格式，直接赋值
      if (props.isUrl) {
        fileList.value = val.map(file => ({ name: file.name, url: file.url, fileId: file.fileId }))
        return
      }
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(',')
      // 获取文件详情
      if (list.length) {
        getFileDetailByids(list.join(','))
      }
    } else {
      fileList.value = []
      return []
    }
  },
  { deep: true, immediate: true }
)
// 处理回显文件
async function getFileDetailByids(ids) {
  const res = await getFileDetail(ids)
  fileList.value = res.data.map(file => {
    return {
      name: file.name,
      url: file.url,
      files: file.fileId,
      uid: file.uid || file.fileId,
    }
  })
}
// 上传前校检格式和大小
function handleBeforeUpload(file) {
  // 校检文件类型
  if (props.fileType.length) {
    const fileName = file.name.split('.')
    const fileExt = fileName[fileName.length - 1]
    const isTypeOk = props.fileType.indexOf(fileExt) >= 0
    if (!isTypeOk) {
      proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join('/')}格式文件!`)
      return false
    }
  }
  // 校检文件名是否包含特殊字符
  if (file.name.includes(',')) {
    proxy.$modal.msgError('文件名不正确，不能包含英文逗号!')
    return false
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`)
      return false
    }
  }
  proxy.$modal.loading('正在上传文件，请稍候...')
  number.value++
  return true
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`)
}

// 上传失败
function handleUploadError(err) {
  proxy.$modal.msgError('上传文件失败')
  proxy.$modal.closeLoading()
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    uploadList.value.push({ name: res.data.name, url: res.data.url, files: res.data.fileId, uid: file.uid })
    uploadedSuccessfully()
  } else {
    number.value--
    proxy.$modal.closeLoading()
    proxy.$modal.msgError(res.msg)
    proxy.$refs.fileUpload.handleRemove(file)
    uploadedSuccessfully()
  }
}

// 删除文件
function handleDelete(index) {
  fileList.value.splice(index, 1)
  emit('update:modelValue', listToString(fileList.value))
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
    uploadList.value = []
    number.value = 0
    emit('change', fileList.value)
    emit('update:modelValue', fileList.value.map(f => f.files).join(','))
    proxy.$modal.closeLoading()
  }
}

// 预览文件
function handlePreview(file) {
  try {
    window.open(import.meta.env.VITE_APP_FILE_BASE_URL + file.url)
  } catch (error) {
    console.error('预览失败:', error)
    proxy.$modal.msgError('预览失败')
  }
}
// 获取文件名称
function getFileName(name) {
  // 如果是url那么取最后的名字 如果不是直接返回
  if (name.lastIndexOf('/') > -1) {
    return name.slice(name.lastIndexOf('/') + 1)
  } else {
    return name
  }
}
// 下载文件
function handleDownload(file) {
  try {
    handleDownloadFile(file.url, file.name)
  } catch (error) {
    console.error('下载文件失败:', error)
    proxy.$modal.msgError('下载文件失败')
  }
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = ''
  separator = separator || ','
  for (let i in list) {
    if (list[i].files) {
      strs += list[i].files + separator
    }
  }
  return strs != '' ? strs.substr(0, strs.length - 1) : ''
}

// 初始化拖拽排序
onMounted(() => {
  if (props.drag && !props.disabled) {
    nextTick(() => {
      const element = proxy.$refs.uploadFileList?.$el || proxy.$refs.uploadFileList
      Sortable.create(element, {
        ghostClass: 'file-upload-darg',
        onEnd: evt => {
          const movedItem = fileList.value.splice(evt.oldIndex, 1)[0]
          fileList.value.splice(evt.newIndex, 0, movedItem)
          emit('update:modelValue', listToString(fileList.value))
        },
      })
    })
  }
})
</script>
<style scoped lang="scss">
.file-upload-darg {
  opacity: 0.5;
  background: #c8ebfb;
}
.upload-file-uploader {
  margin-bottom: 5px;
}
.line {
  display: flex;
  .el-upload-list__item {
    width: fit-content;
    margin-right: 6px;
    border: none !important;
    &::after {
      content: '、';
      color: var(--el-color-primary);
    }
  }
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
  transition: none !important;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
